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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package com.sun.tools.example.debug.tty; | ||
| 27 | |||
| 28 | import com.sun.jdi.*; | ||
| 29 | import com.sun.jdi.event.*; | ||
| 30 | import com.sun.jdi.request.EventRequest; | ||
| 31 | |||
| 32 | public class EventHandler implements Runnable { | ||
| 33 | |||
| 34 | EventNotifier notifier; | ||
| 35 | Thread thread; | ||
| 36 | volatile boolean connected = true; | ||
| 37 | boolean completed = false; | ||
| 38 | String shutdownMessageKey; | ||
| 39 | boolean stopOnVMStart; | ||
| 40 | |||
| 41 | EventHandler(EventNotifier notifier, boolean stopOnVMStart) { | ||
| 42 | this.notifier = notifier; | ||
| 43 | this.stopOnVMStart = stopOnVMStart; | ||
| 44 | this.thread = new Thread(this, "event-handler"); | ||
| 45 | this.thread.start(); | ||
| 46 | } | ||
| 47 | |||
| 48 | synchronized void shutdown() { | ||
| 49 | connected = false; // force run() loop termination | ||
| 50 | thread.interrupt(); | ||
| 51 | while (!completed) { | ||
| 52 | try {wait();} catch (InterruptedException exc) {} | ||
| 53 | } | ||
| 54 | } | ||
| 55 | |||
| 56 | @Override | ||
| 57 | public void run() { | ||
| 58 | EventQueue queue = Env.vm().eventQueue(); | ||
| 59 | while (connected) { | ||
| 60 | try { | ||
| 61 | EventSet eventSet = queue.remove(); | ||
| 62 | boolean resumeStoppedApp = false; | ||
| 63 | EventIterator it = eventSet.eventIterator(); | ||
| 64 | while (it.hasNext()) { | ||
| 65 | resumeStoppedApp |= !handleEvent(it.nextEvent()); | ||
| 66 | } | ||
| 67 | |||
| 68 | if (resumeStoppedApp) { | ||
| 69 | eventSet.resume(); | ||
| 70 | } else if (eventSet.suspendPolicy() == EventRequest.SUSPEND_ALL) { | ||
| 71 | setCurrentThread(eventSet); | ||
| 72 | notifier.vmInterrupted(); | ||
| 73 | } | ||
| 74 | } catch (InterruptedException exc) { | ||
| 75 | // Do nothing. Any changes will be seen at top of loop. | ||
| 76 | } catch (VMDisconnectedException discExc) { | ||
| 77 | handleDisconnectedException(); | ||
| 78 | break; | ||
| 79 | } | ||
| 80 | } | ||
| 81 | synchronized (this) { | ||
| 82 | completed = true; | ||
| 83 | notifyAll(); | ||
| 84 | } | ||
| 85 | } | ||
| 86 | |||
| 87 | private boolean handleEvent(Event event) { | ||
| 88 | notifier.receivedEvent(event); | ||
| 89 | |||
| 90 | if (event instanceof ExceptionEvent) { | ||
| 91 | return exceptionEvent(event); | ||
| 92 | } else if (event instanceof BreakpointEvent) { | ||
| 93 | return breakpointEvent(event); | ||
| 94 | } else if (event instanceof WatchpointEvent) { | ||
| 95 | return fieldWatchEvent(event); | ||
| 96 | } else if (event instanceof StepEvent) { | ||
| 97 | return stepEvent(event); | ||
| 98 | } else if (event instanceof MethodEntryEvent) { | ||
| 99 | return methodEntryEvent(event); | ||
| 100 | } else if (event instanceof MethodExitEvent) { | ||
| 101 | return methodExitEvent(event); | ||
| 102 | } else if (event instanceof ClassPrepareEvent) { | ||
| 103 | return classPrepareEvent(event); | ||
| 104 | } else if (event instanceof ClassUnloadEvent) { | ||
| 105 | return classUnloadEvent(event); | ||
| 106 | } else if (event instanceof ThreadStartEvent) { | ||
| 107 | return threadStartEvent(event); | ||
| 108 | } else if (event instanceof ThreadDeathEvent) { | ||
| 109 | return threadDeathEvent(event); | ||
| 110 | } else if (event instanceof VMStartEvent) { | ||
| 111 | return vmStartEvent(event); | ||
| 112 | } else { | ||
| 113 | return handleExitEvent(event); | ||
| 114 | } | ||
| 115 | } | ||
| 116 | |||
| 117 | private boolean vmDied = false; | ||
| 118 | private boolean handleExitEvent(Event event) { | ||
| 119 | if (event instanceof VMDeathEvent) { | ||
| 120 | vmDied = true; | ||
| 121 | return vmDeathEvent(event); | ||
| 122 | } else if (event instanceof VMDisconnectEvent) { | ||
| 123 | connected = false; | ||
| 124 | if (!vmDied) { | ||
| 125 | vmDisconnectEvent(event); | ||
| 126 | } | ||
| 127 | Env.shutdown(shutdownMessageKey); | ||
| 128 | return false; | ||
| 129 | } else { | ||
| 130 | throw new InternalError(MessageOutput.format("Unexpected event type", | ||
| 131 | new Object[] {event.getClass()})); | ||
| 132 | } | ||
| 133 | } | ||
| 134 | |||
| 135 | synchronized void handleDisconnectedException() { | ||
| 136 | /* | ||
| 137 | * A VMDisconnectedException has happened while dealing with | ||
| 138 | * another event. We need to flush the event queue, dealing only | ||
| 139 | * with exit events (VMDeath, VMDisconnect) so that we terminate | ||
| 140 | * correctly. | ||
| 141 | */ | ||
| 142 | EventQueue queue = Env.vm().eventQueue(); | ||
| 143 | while (connected) { | ||
| 144 | try { | ||
| 145 | EventSet eventSet = queue.remove(); | ||
| 146 | EventIterator iter = eventSet.eventIterator(); | ||
| 147 | while (iter.hasNext()) { | ||
| 148 | handleExitEvent(iter.next()); | ||
| 149 | } | ||
| 150 | } catch (InterruptedException exc) { | ||
| 151 | // ignore | ||
| 152 | } catch (InternalError exc) { | ||
| 153 | // ignore | ||
| 154 | } | ||
| 155 | } | ||
| 156 | } | ||
| 157 | |||
| 158 | private ThreadReference eventThread(Event event) { | ||
| 159 | if (event instanceof ClassPrepareEvent) { | ||
| 160 | return ((ClassPrepareEvent)event).thread(); | ||
| 161 | } else if (event instanceof LocatableEvent) { | ||
| 162 | return ((LocatableEvent)event).thread(); | ||
| 163 | } else if (event instanceof ThreadStartEvent) { | ||
| 164 | return ((ThreadStartEvent)event).thread(); | ||
| 165 | } else if (event instanceof ThreadDeathEvent) { | ||
| 166 | return ((ThreadDeathEvent)event).thread(); | ||
| 167 | } else if (event instanceof VMStartEvent) { | ||
| 168 | return ((VMStartEvent)event).thread(); | ||
| 169 | } else { | ||
| 170 | return null; | ||
| 171 | } | ||
| 172 | } | ||
| 173 | |||
| 174 | private void setCurrentThread(EventSet set) { | ||
| 175 | ThreadReference thread; | ||
| 176 | if (set.size() > 0) { | ||
| 177 | /* | ||
| 178 | * If any event in the set has a thread associated with it, | ||
| 179 | * they all will, so just grab the first one. | ||
| 180 | */ | ||
| 181 | Event event = set.iterator().next(); // Is there a better way? | ||
| 182 | thread = eventThread(event); | ||
| 183 | } else { | ||
| 184 | thread = null; | ||
| 185 | } | ||
| 186 | setCurrentThread(thread); | ||
| 187 | } | ||
| 188 | |||
| 189 | private void setCurrentThread(ThreadReference thread) { | ||
| 190 | ThreadInfo.invalidateAll(); | ||
| 191 | ThreadInfo.setCurrentThread(thread); | ||
| 192 | } | ||
| 193 | |||
| 194 | private boolean vmStartEvent(Event event) { | ||
| 195 | VMStartEvent se = (VMStartEvent)event; | ||
| 196 | notifier.vmStartEvent(se); | ||
| 197 | return stopOnVMStart; | ||
| 198 | } | ||
| 199 | |||
| 200 | private boolean breakpointEvent(Event event) { | ||
| 201 | BreakpointEvent be = (BreakpointEvent)event; | ||
| 202 | notifier.breakpointEvent(be); | ||
| 203 | return true; | ||
| 204 | } | ||
| 205 | |||
| 206 | private boolean methodEntryEvent(Event event) { | ||
| 207 | MethodEntryEvent me = (MethodEntryEvent)event; | ||
| 208 | notifier.methodEntryEvent(me); | ||
| 209 | return true; | ||
| 210 | } | ||
| 211 | |||
| 212 | private boolean methodExitEvent(Event event) { | ||
| 213 | MethodExitEvent me = (MethodExitEvent)event; | ||
| 214 | return notifier.methodExitEvent(me); | ||
| 215 | } | ||
| 216 | |||
| 217 | private boolean fieldWatchEvent(Event event) { | ||
| 218 | WatchpointEvent fwe = (WatchpointEvent)event; | ||
| 219 | notifier.fieldWatchEvent(fwe); | ||
| 220 | return true; | ||
| 221 | } | ||
| 222 | |||
| 223 | private boolean stepEvent(Event event) { | ||
| 224 | StepEvent se = (StepEvent)event; | ||
| 225 | notifier.stepEvent(se); | ||
| 226 | return true; | ||
| 227 | } | ||
| 228 | |||
| 229 | private boolean classPrepareEvent(Event event) { | ||
| 230 | ClassPrepareEvent cle = (ClassPrepareEvent)event; | ||
| 231 | notifier.classPrepareEvent(cle); | ||
| 232 | |||
| 233 | if (!Env.specList.resolve(cle)) { | ||
| 234 | MessageOutput.lnprint("Stopping due to deferred breakpoint errors."); | ||
| 235 | return true; | ||
| 236 | } else { | ||
| 237 | return false; | ||
| 238 | } | ||
| 239 | } | ||
| 240 | |||
| 241 | private boolean classUnloadEvent(Event event) { | ||
| 242 | ClassUnloadEvent cue = (ClassUnloadEvent)event; | ||
| 243 | notifier.classUnloadEvent(cue); | ||
| 244 | return false; | ||
| 245 | } | ||
| 246 | |||
| 247 | private boolean exceptionEvent(Event event) { | ||
| 248 | ExceptionEvent ee = (ExceptionEvent)event; | ||
| 249 | notifier.exceptionEvent(ee); | ||
| 250 | return true; | ||
| 251 | } | ||
| 252 | |||
| 253 | private boolean threadDeathEvent(Event event) { | ||
| 254 | ThreadDeathEvent tee = (ThreadDeathEvent)event; | ||
| 255 | ThreadInfo.removeThread(tee.thread()); | ||
| 256 | return false; | ||
| 257 | } | ||
| 258 | |||
| 259 | private boolean threadStartEvent(Event event) { | ||
| 260 | ThreadStartEvent tse = (ThreadStartEvent)event; | ||
| 261 | ThreadInfo.addThread(tse.thread()); | ||
| 262 | notifier.threadStartEvent(tse); | ||
| 263 | return false; | ||
| 264 | } | ||
| 265 | |||
| 266 | public boolean vmDeathEvent(Event event) { | ||
| 267 | shutdownMessageKey = "The application exited"; | ||
| 268 | notifier.vmDeathEvent((VMDeathEvent)event); | ||
| 269 | return false; | ||
| 270 | } | ||
| 271 | |||
| 272 | public boolean vmDisconnectEvent(Event event) { | ||
| 273 | shutdownMessageKey = "The application has been disconnected"; | ||
| 274 | notifier.vmDisconnectEvent((VMDisconnectEvent)event); | ||
| 275 | return false; | ||
| 276 | } | ||
| 277 | } | ||